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No. 6l7,067. Patented Ian. 3, I899. J. T. WILLIAMS.

.HELIX FOB ELECTRICAL APPARATUS.

' (Application filed Apr. 3, 1895.)

(No Mogul.)

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UNITED STATES PATENT OFFICE.

JOIIN T. ILLIAMS, OF NEIV YORK, N. Y.

HELIX FOR ELECTRICAL APPARATUS.

SPECIFICATION forming part of Letters Patent No. 617,067, dated January 3, 1899.

Application filed April 3, 1895. Serial No. 544,286- (No model.)

To all whom it may concern:

Be it known that I, JOHN T. WILLIAMs, a citizen of the United States, residing at New York, (Brooklyn,) in the county of Kings and State of NewYork, haveinvented certain new and useful Improvements in IIelices for Electrical Apparatus, of which the following is a full, clear, and exact description.

This invention relates to means for overcoming, diverting, or suppressing self-induction in electromagnetic apparatus, the object being to reduce or prevent the retarding or impeding eliect which self-induction creates in all forms of electromagnetic apparatus wherein alternating, pulsating, intermittent, or other irregular currents flow.

My invention consists in combining with the ordinary convolutions or winding of an electromagnet a second open-circuited conductor or winding, either connected or disconnected with the first and so arranged with respect to the first or main winding as to be inductively related thereto-that is, the second winding or conductor is placed in position to have induced in it a current of electricity when an irregular current of any character is sent through the main wire or convolutions.

The eitect of the second conductorso related to the first or main conductor is apparently to divert the induced currents from the main winding to the second winding, the second winding in receiving the charge acting as a plate of a condenser. I prefer to wind the two conductors upon the core simultaneously, alternating the convolutions of the two windings, so that the inductive relation between the two conductors will be most intimate and the suppression of retarding induction most pronounced.

The second winding may be entirely disconnected and insulated from the main windingthat is, both of its ends may be disconnected and free-but substantially the same, if not better, results are obtained by connecting one end of the second winding with one end of the main winding, leaving the other endof the second winding open.

the core in conjunction with a second wire Z The two wires are placed in close parallel relation and are wound upon the core or spool simultaneously, thus causing the convolu tions of the two wires to alternate in their positions in the helix. This is the preferred way of constructing the helix; but the second wire Z7 may, if desired, be placed upon the spool in any other position with respect to the convolutions of the wire a so long as the two wires are in inductive relation with each other. For instance, the two wires may be wound in alternate layers either parallel or at right angles to the core or one winding may be entirely without or surrounding the other. The terminals of the wire I) are brought out of the coil and left open, as shown in full lines, or one end may be connected with one of the terminals of the main winding, as shown in dotted lines at Z2 while the other end is left open, as shown at b.

In use the counter-current which is induced by the interruption of the current in the coil a is taken up by or diverted into the wire I), and therefore does not act to impede the flow of the main current in coil a.

In experiments with this invention the two windings'or conductors seem to act in the nature of a condenser, each winding being one of the condenser elements or plates and the static capacity of one serving to neutralize, divert, or suppress the self-induction of the other. I find I get the best results when one end of the second conductor is attached to the main winding of the coil; but the results are excellent when both terminals are disconnected.

I am aware that it is not new to suppress self-induction by associating neutralizingcondensers with the circuit; nor is it new to suppress self-induction in coils by means of closed circuits, such as rings and cylinders of metal placed in inductive relation with the coils; but the result in such instances is different from the result obtained with an asso ciated open-circuited conductor, for in the latter case the static charge does not affect the magnetic condition of the core, while in the former case the dynamic electricity cir" oulating in the closed conductor does affect the magnetic condition of the core and in a way to delay or impede the main current.

I am also aware that a Ituhmkorff coil with ICO a secondary having sparking terminals is old; but such a secondary winding so arranged does not lessen the impedance or self-induction of the primary, because a sparking distance is the equivalent of a closed circuit, inasmuch as it permits of the passage of current, and hence the current in the secondary reacts upon the magnetic core.

Having thus described my invention, I claim 1. The combination of a coil or helix and a second open-circuited coil or helix wound in inductive relation thereto, for the purpose of suppressing the impedance or self-induction therein, substantially as described.

2. The combination of a coil or helix, and a second coil or helix the convolu tions of which alternate with those of the first coil or helix, the circuit of the second coil being open at one end and connected at its other end with the first coil.

3. In electromagnetic apparatus, a main coil or helix, combined with a second coil or helix, said two coils or helices being placed in parallel relation and sim ultaneously wound upon the spool so that the convolutions of the two coils will alternate with each other throughout, the circuit of the second coil being open.

a. In electromagnetic apparatus,the combination with the helices or convolutions thereof, of a conductor in reciprocal inductive relation with the wires composing said helices or convolutions, for the purpose of suppressing the impedance or self-induction therein, substantially as described.

5. A combined electromagnet and condenser, the condenser having for one of its plates the winding of the electromagnet, for the other a second conductor interposed between the several convolutions of the said winding in inductive relation thereto.

6. A combined electromagnet and condenser, the condenser having for one of its plates the winding of the electromagnet and for the other a second conductor interposed between the wires of the said magnet-winding in inductive relation thereto.

In testimony whereof I subscribe my signature in presence of two witnesses.

JOHN T. WILLIAMS.

Witnesses:

FRANK S. OBEn, JOHN Knancnn. 

